Air- and fuel-path coordinated control for advanced combustion mode transitions in Diesel engines

This paper presents an air- and fuel-path coordinated methodology for Diesel engine advanced combustion mode transient control. In the air-path loop, a reference governor method was utilized for the control of intake manifold conditions, so as to the in-cylinder conditions (ICCs) at the crank angle of intake valve closing. In the fuel-path loop, the active and rapid fuel injection timing and mass adjustments were employed, in conjunction with the air-path loop control, to improve the transient operations on advanced combustion mode transitions. This research is based on a Diesel engine equipped by dual-loop EGR (exhaust gas recirculation), VGT (variable geometry turbocharger), and HPCR (high pressure common rail) fuel injection systems. The effectiveness of such a control methodology was validated through simulations based on a high-fidelity, GT-Power, Diesel engine model.